import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        while (a  < b) {
             a++;
            if(a%2==0&&a!=b) {
                System.out.println(a);
            }

        }

    }
}